| natural ventilation |
Ventilation of a mine without the aid of fans or furnaces. Nip Device at the end of the trailing cable of a mining machine used for connecting the trailing cable to the trolley wire and ground.
출처: www.netl.doe.gov/coal/Coal%20Primer/glossary.html
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|---|---|
| natural ventilation |
Ventilation not induced by artificial means.
출처: www.readinganthracite.com/glossary.htm
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| natural history |
The study of animals or plants; the sum of the facts about the animals and plants of an area or class.
출처: www.spaceforspecies.ca/glossary/n_o.htm
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| natural selection |
the resulting survival and reproduction of organisms due to the varying effects of environmental forces on genetically different members of a population; results in the preservation of favorable adaptations.
출처: www.pen.k12.va.us/VDOE/LFB/glossary/n_o.html
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| natural |
the eyes natural lens that bends light (refracts) to provide some of the focusing power of the eye. The eye's natural lens is able to change shape allowing the eye to focus at different distances.
출처: www.fda.gov/cdrh/phakic/glossary.html
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